Fault detection method, device and equipment for common rail system of engine and medium

The invention discloses a fault detection method and device for an engine common rail system, equipment and a medium, and the method comprises the steps: obtaining the service time of an engine when the engine is normally stopped from idle speed; selecting a corresponding rail pressure curve of the engine according to the use duration of the engine; whether the rail pressure of the engine is in a stable state or not is judged, if yes, the first moment when the rail pressure of the engine is in the stable state and the first rail pressure are obtained, and timing is started; when the timing duration reaches the preset detection time amount, second rail pressure of the engine is obtained; according to the rail pressure curve, the first moment and the preset detection time amount, a fault judgment threshold value corresponding to the use duration of the engine is determined; the rail pressure difference value between the second rail pressure and the first rail pressure is obtained; whether the rail pressure diff